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CE Materials Midterm Exam

Total questions: 60

Worksheet time: 3600secs

Name
Class
Date
1.

Construction material structural matrix types include:

a)

cyclic

b)

amorphous

c)

external

d)

substrate

2.

Masonry walls retain their structure for temperature in Celsius up to:

a)

400

b)

600

c)

800

d)

1000

3.

Compared to 80 ksi steel, the yield strength for 70% glass-titanium alloy is:

a)

0.5 times higher

b)

2 times higher

c)

3 times higher

d)

5 times higher

4.

The material group that is ductile but susceptible to fire is:

a)

mineral-based materials

b)

metal-based materials

c)

organic materials

d)

inorganic materials

5.

Plastic stress-strain for steel occurs in:

a)

Zone I

b)

Zone II

c)

Zone III

d)

Zone IV

6.

Scratch resistance of minerals follows the hardness scale of:

a)

Brinell

b)

Moh

c)

Rockwell

d)

Vickers

7.

The thermal entity involving thermal stress cracking of concrete is:

a)

specific heat capacity

b)

thermal conductivity

c)

thermal expansivity

d)

enthalpy of formation

8.

Moisture absorption factors include:

a)

volumetric water content

b)

gravimetric water content

c)

absorption weight

d)

all the above

9.

Example failure modes are:

a)

tension parallel to grain

b)

nail pull out

c)

exposed rusting rebar

d)

all of the above

10.

The bond with shared electron pairs in a joint orbital is:

a)

metallic

b)

hydrogen

c)

ionic

d)

covalent

11.

A metal with a face-centered cubic structure is:

a)

magnesium

b)

zinc

c)

aluminum

d)

titanium

12.

Carbon entrapment in the α-iron structure during rapid quenching causes:

a)

decreased strength and increased ductility

b)

increased strength and increased ductility

c)

increased strength and increased brittleness

d)

decreased strength and increased brittleness

13.

Hot-working of metals:

a)

saves energy during production

b)

prevents strain hardening through recrystallization

c)

achieves greater metal hardness without decreasing strength

d)

requires specialty materials additives to inhibit cooling

14.

Cast iron’s strength and toughness improve by:

a)

rapid cooling

b)

added silicon

c)

added cerium

d)

increased carbon content

15.

Tempering hardened steel:

a)

allows recasting

b)

increases brittleness

c)

reduces internal stress

d)

allows faster cooling after quenching

16.

Chemical corrosion damage occurs for steel acting as the:

a)

anode

b)

cathode

c)

diode

d)

geode

17.

Thermite welding’s most common use is:

a)

laminate steel sheets

b)

underwater

c)

join large steel sections

d)

spatial satellite repair

18.

Galvanized steel has:

a)

laminated sheets of multiple metals

b)

a thin zinc coating

c)

a high chromium content

d)

a partial coat of gray paint

19.

Cambering in steel production refers to:

a)

stretching or compressing beams to increase axial strength

b)

forging to a desired form

c)

reshaping reclaimed steel at low temperatures

d)

intentional bending of beams to offset dead-load deflection

20.

Decreasing structural steel’s temperature from ambient conditions to below freezing:

a)

increases ductility but decreases yield strength

b)

decreases both ductility and yield strength

c)

increases both ductility and yield strength

d)

decreases ductility but increases yield strength

21.

Direct oxidation for metals occurs:

a)

at high temperature

b)

in association with electrolytes like saltwater

c)

after the onset of creep

d)

as biochemical degradation in a moist environment

22.

Beam connections forming the strongest bond are:

a)

welded

b)

bolted

c)

riveted

d)

forged

23.

Concrete design application requiring both tensile and compressive loads include:

a)

tip-up panels

b)

road pavements

c)

pre-cast I beams

d)

residential footings

24.

The water-cement ratio required for full hydration is:

a)

0.25

b)

0.35

c)

0.45

d)

0.55

25.

Air-dried concrete compared to saturated concrete for compression tests is:

a)

stronger

b)

more ductile

c)

weaker

d)

more porous

26.

Increasing lateral pressure on concrete causes increased:

a)

voids

b)

bonding with rebar

c)

compressive strength

d)

long-term creep

27.

The initial tangent modulus for a reloaded concrete cylinder is:

a)

equal to the initial tangent modulus for the initial load

b)

lower than the tangent modulus near yield strength

c)

equal to the final tangent modulus unloading

d)

changes less quickly through the elastic region than the initial load

28.

Concrete shrinkage caused by limited availability of free water is:

a)

plastic

b)

autogenous

c)

elastic

d)

carbonation

29.

Concrete’s thermal expansion coefficient depends mainly on:

a)

admixtures

b)

water-cement ratio at placement

c)

the current temperature

d)

the current moisture content

30.

Slump tests with shear failure typically indicate:

a)

poorly graded aggregate

b)

rounded aggregate

c)

too little cement paste

d)

high water-cement ratio

31.

with shear failure typically indicate (5a_130):

a)

poorly graded aggregate

b)

rounded aggregate

c)

too little cement paste

d)

high water-cement ratio

32.

The slump failure type shown is (5a_131):

a)

perfect

b)

true

c)

shear

d)

collapse

33.

Workable concretes have (5a_132):

a)

both high yield stress and plastic viscosity

b)

low yield stress and high plastic viscosity

c)

high yield stress and low plastic viscosity

d)

both low yield stress and plastic viscosity

34.

Workability reduces with time due to (5a_134):

a)

water absorption into the aggregate

b)

water evaporation

c)

cement-admixture interaction

d)

all of the above

35.

Method(s) to slow reduction of workability include (5a_134):

a)

continuous agitation

b)

compaction

c)

use of dry aggregate

d)

all of the above

36.

The rapidly hardening cement constituent that contributes to early strength is (PP05_14):

a)

tricalcium silicate

b)

dicalcium silicate

c)

tricalcium aluminate

d)

tetracalcium aluminoferrite

37.

Water migration at the bottom or top of concrete is (PP05_02):

a)

sweating

b)

bleeding

c)

separation

d)

seepage

38.

Surface coatings for aggregate particles typically include (04_200):

a)

tetracalcium aluminoferrite

b)

iron oxide

c)

calcium oxide

d)

dicalcium silicate

39.

Rock porosity is defined as (04_196):

a)

tetracalcium aluminoferrite

b)

iron oxide

c)

calcium oxide

d)

dicalcium silicate

40.

The four aggregate moisture states include: (04_197):

a)

saturated, moistened, super-suctioned, dessicated

b)

wet, saturated-surface-dry, air-dry, oven-dry

c)

wet, oversaturated, normally saturated, and dehydrated

d)

Oregon, Hawaii, Washington, and Alaska

41.

The three rock classifications are: (04_190):

a)

igneous, metamorphic, sedimentary

b)

island, bed, continental

c)

volcanic, layered, petrified

d)

rough, smooth, angular

42.

Aggregate gradations containing two main sizes are (04_193):

a)

gap-graded

b)

open-graded

c)

continuously graded

d)

ungraded

43.

The porosity type also known as effective porosity is (04_196):

a)

discontinuous

b)

vuggy

c)

interparticle

d)

interconnected

44.

Concrete has an aggregate percentage by weight of (PP4_2):

a)

10-25%

b)

30-55%

c)

60-75%

d)

80-95%

45.

Aggregate shrinkage in concrete causes (PP4_11):

a)

cracking

b)

deflection of beams and slabs

c)

chipping and crumbling

d)

all of the above

46.

Hydroxylated carboxylic acid is a (PP4_24):

a)

mineral admixture

b)

plasticizer

c)

retardant

d)

air entrainer

47.

Aggregate considered heavyweight includes (PP4_5):

a)

steel pellets

b)

brick

c)

ceramic

d)

limestone

48.

Applications for heavyweight aggregate in concrete include (PP4_5):

a)

dams of large reservoirs

b)

insulation in low temperature environments

c)

shielding against radiation exposure

d)

foundations for massive buildings

49.

Air entrainers (PP4_5):

a)

increase bleeding in wet concrete

b)

create nanometer-scale pores in cured concrete

c)

come in the form of wood resins

d)

increase the rate of curing

50.

Sparlock module widths are (8a_1):

a)

4 inches

b)

8 inches

c)

12 inches

d)

16 inches

51.

Bulk winning advantages include (8b_1):

a)

reduce the impact of localized variations

b)

allows excavation during good weather only

c)

mitigates impact of quarry operation stoppage on production

d)

all of the above

52.

Frogged bricks advantage over solid bricks is (labc.co.uk/news/dont-get-hopping-mad-about-laying-bricks):

a)

lower risk of sound transfer if laid upside down

b)

enhanced mortar adhesion

c)

lower mortar requirement

d)

all of the above

53.

Wet bricks are conditioned before firing at (8b_3):

a)

60-80oC in a dry environment

b)

60-80oC in a moist environment

c)

80-80oC in a dry environment

d)

80-100oC in a moist environment

54.

Vitrification of clay bricks includes (8b_3):

a)

increased water resistance

b)

volume expansion

c)

hydration reaction

d)

separation of clay and impurities

55.

Economically the best kiln type is (8b_4):

a)

branch

b)

tunnel

c)

intermittent

d)

chamber

56.

Lightweight concrete blocks (8a_6,9):

a)

decrease thermal efficiency

b)

increase lateral force resistance

c)

decrease installation time

d)

require grout to stabilize electrical and plumbing pipes

57.

An 80%Al-20%Cu alloy at 500oC has a fractional Al:θ phase ratio of (imetllc.com/phase-diagram):

a)

2:1

b)

3:1

c)

1:2

d)

1:3

58.

200 kN on a 0.25-m2 concrete column has normal vertical stress of (02_18):

a)

800,000 Pa

b)

800 kN/m2

c)

0.0008 GPa

d)

all of the above

59.

The molecular structure shown is (02_13):

a)

face-centered cubic

b)

hexagonal-close-pack

c)

octahedral

d)

body-centered cubic

60.

Aluminum holds up to 5.7% copper in solution at (02_34):

a)

126oC

b)

232oC

c)

548oC

d)

783oC

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